Dr. I.B. MauryaALKA KANWAT2024-10-262024-10-262024https://krishikosh.egranth.ac.in/handle/1/5810215896The study was conducted at the Protected Cultivation Unit in the Department of Vegetable Science, College of Horticulture and Forestry, Jhalawar, from June 2023 to December 2023. Its aim was to evaluate the “Effects of paclobutrazol and cycocel on growth and yield parameters of cucumber (Cucumis sativus L.) under polyhouse conditions”. The experiment involved two plant growth retardants Paclobutrazol (PBZ) and cycocel (CCC) with each being applied at three different concentrations (50, 100, and 150 ppm), as well as two control conditions (with and without pruning). The study was organized using a Randomized Block Design (RBD) with three replications. The results showed that treating seeds with PBZ at 100 ppm reduced seedling height by 48.0% while registering maximum germination (98.33%) and seedling survival (99.56%). The treatment with PBZ at 100 ppm without pruning (T3) reduced plant height by 17.8% and internodal length by 27.27%, resulting in the lowest plant height (320.46 cm) and internodal length (6.40 cm) compared to controls (389.31 cm and 9.67 cm, respectively). This treatment also decreased leaf area but increased the number of leaves per plant. Conversely, the best results for chlorophyll content (2.133 mg/g), photosynthetic active radiation (915.33), leaf area (261.31 cm²), number of fruits per plant (34.69), fruit diameter (4.56 cm), fruit length (17.54 cm), average fruit weight (177.70 g), and fruit yield per plant (2.90 kg) were observed with PBZ at 100 ppm with pruning (T9). This treatment also reduced unmarketable fruit yield per plant, the time to first harvest (44.60 days), and the node at which the first female flower appeared (3.27). Overall, the study suggests that treating seeds with PBZ at 100 ppm combined with pruning (T9) is the most effective approach, as it increased yield by 43.02%, net return (Rs. 194,583.70), and the B:C ratio (4.13).EnglishThesis